Actinozoa -

Actinozoans are the primary architects of , which are among the most biodiverse ecosystems on Earth. Stony corals secrete calcium carbonate skeletons that form the structural foundation of these reefs, providing habitat for thousands of other marine species.

: Unlike many other cnidarians (such as jellyfish), Actinozoans do not have a medusa (free-swimming) stage in their life cycle. They remain as polyps throughout their lives. actinozoa

: Includes sea anemones and stony corals. They typically have tentacles and mesenteries in multiples of six. Actinozoans are the primary architects of , which

The name Actinozoa stems from the Greek words aktis (ray) and zoon (animal), referring to their radial symmetry and the "ray-like" appearance of their tentacles. Actinozoans are the primary architects of